ION EXCHANGE MEMBRANE AND METHOD FOR PRODUCING SAME

摘要

[Problems] To provide an ion-exchange membrane using an inexpensive nonwoven fabric sheet as a base sheet, featuring excellent properties such as strength, dimensional stability and shape stability, effectively suppressing undulation when it is brought into contact with the electrolyte, and having a low membrane resistance and stable properties. [Means for Solution] An ion-exchange membrane comprising a nonwoven fabric sheet 1 and an ion-exchange resin coating 3 formed on one surface of the nonwoven fabric sheet 1, the nonwoven fabric sheet 1 having a fiber layer structure that includes long filament layers 5 of a fiber diameter of 8 to 30 µm on both surfaces thereof and an extra-fine filament layer 7 of a fiber diameter of not more than 5 µm as an intermediate layer formed by melt-adhesion of fibers between the long filament layers 5.